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1 <?php 2 /** 3 * Upgrade API: Core_Upgrader class 4 * 5 * @package WordPress 6 * @subpackage Upgrader 7 * @since 4.6.0 8 */ 9 10 /** 11 * Core class used for updating core. 12 * 13 * It allows for WordPress to upgrade itself in combination with 14 * the wp-admin/includes/update-core.php file. 15 * 16 * @since 2.8.0 17 * @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader.php. 18 * 19 * @see WP_Upgrader 20 */ 21 class Core_Upgrader extends WP_Upgrader { 22 23 /** 24 * Initialize the upgrade strings. 25 * 26 * @since 2.8.0 27 */ 28 public function upgrade_strings() { 29 $this->strings['up_to_date'] = __( 'WordPress is at the latest version.' ); 30 $this->strings['locked'] = __( 'Another update is currently in progress.' ); 31 $this->strings['no_package'] = __( 'Update package not available.' ); 32 /* translators: %s: Package URL. */ 33 $this->strings['downloading_package'] = sprintf( __( 'Downloading update from %s…' ), '<span class="code">%s</span>' ); 34 $this->strings['unpack_package'] = __( 'Unpacking the update…' ); 35 $this->strings['copy_failed'] = __( 'Could not copy files.' ); 36 $this->strings['copy_failed_space'] = __( 'Could not copy files. You may have run out of disk space.' ); 37 $this->strings['start_rollback'] = __( 'Attempting to roll back to previous version.' ); 38 $this->strings['rollback_was_required'] = __( 'Due to an error during updating, WordPress has rolled back to your previous version.' ); 39 } 40 41 /** 42 * Upgrade WordPress core. 43 * 44 * @since 2.8.0 45 * 46 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass. 47 * @global callable $_wp_filesystem_direct_method 48 * 49 * @param object $current Response object for whether WordPress is current. 50 * @param array $args { 51 * Optional. Arguments for upgrading WordPress core. Default empty array. 52 * 53 * @type bool $pre_check_md5 Whether to check the file checksums before 54 * attempting the upgrade. Default true. 55 * @type bool $attempt_rollback Whether to attempt to rollback the chances if 56 * there is a problem. Default false. 57 * @type bool $do_rollback Whether to perform this "upgrade" as a rollback. 58 * Default false. 59 * } 60 * @return string|false|WP_Error New WordPress version on success, false or WP_Error on failure. 61 */ 62 public function upgrade( $current, $args = array() ) { 63 global $wp_filesystem; 64 65 require ABSPATH . WPINC . '/version.php'; // $wp_version; 66 67 $start_time = time(); 68 69 $defaults = array( 70 'pre_check_md5' => true, 71 'attempt_rollback' => false, 72 'do_rollback' => false, 73 'allow_relaxed_file_ownership' => false, 74 ); 75 $parsed_args = wp_parse_args( $args, $defaults ); 76 77 $this->init(); 78 $this->upgrade_strings(); 79 80 // Is an update available? 81 if ( ! isset( $current->response ) || 'latest' === $current->response ) { 82 return new WP_Error( 'up_to_date', $this->strings['up_to_date'] ); 83 } 84 85 $res = $this->fs_connect( array( ABSPATH, WP_CONTENT_DIR ), $parsed_args['allow_relaxed_file_ownership'] ); 86 if ( ! $res || is_wp_error( $res ) ) { 87 return $res; 88 } 89 90 $wp_dir = trailingslashit( $wp_filesystem->abspath() ); 91 92 $partial = true; 93 if ( $parsed_args['do_rollback'] ) { 94 $partial = false; 95 } elseif ( $parsed_args['pre_check_md5'] && ! $this->check_files() ) { 96 $partial = false; 97 } 98 99 /* 100 * If partial update is returned from the API, use that, unless we're doing 101 * a reinstallation. If we cross the new_bundled version number, then use 102 * the new_bundled zip. Don't though if the constant is set to skip bundled items. 103 * If the API returns a no_content zip, go with it. Finally, default to the full zip. 104 */ 105 if ( $parsed_args['do_rollback'] && $current->packages->rollback ) { 106 $to_download = 'rollback'; 107 } elseif ( $current->packages->partial && 'reinstall' !== $current->response && $wp_version === $current->partial_version && $partial ) { 108 $to_download = 'partial'; 109 } elseif ( $current->packages->new_bundled && version_compare( $wp_version, $current->new_bundled, '<' ) 110 && ( ! defined( 'CORE_UPGRADE_SKIP_NEW_BUNDLED' ) || ! CORE_UPGRADE_SKIP_NEW_BUNDLED ) ) { 111 $to_download = 'new_bundled'; 112 } elseif ( $current->packages->no_content ) { 113 $to_download = 'no_content'; 114 } else { 115 $to_download = 'full'; 116 } 117 118 // Lock to prevent multiple Core Updates occurring. 119 $lock = WP_Upgrader::create_lock( 'core_updater', 15 * MINUTE_IN_SECONDS ); 120 if ( ! $lock ) { 121 return new WP_Error( 'locked', $this->strings['locked'] ); 122 } 123 124 $download = $this->download_package( $current->packages->$to_download, true ); 125 126 // Allow for signature soft-fail. 127 // WARNING: This may be removed in the future. 128 if ( is_wp_error( $download ) && $download->get_error_data( 'softfail-filename' ) ) { 129 // Output the failure error as a normal feedback, and not as an error: 130 /** This filter is documented in wp-admin/includes/update-core.php */ 131 apply_filters( 'update_feedback', $download->get_error_message() ); 132 133 // Report this failure back to WordPress.org for debugging purposes. 134 wp_version_check( 135 array( 136 'signature_failure_code' => $download->get_error_code(), 137 'signature_failure_data' => $download->get_error_data(), 138 ) 139 ); 140 141 // Pretend this error didn't happen. 142 $download = $download->get_error_data( 'softfail-filename' ); 143 } 144 145 if ( is_wp_error( $download ) ) { 146 WP_Upgrader::release_lock( 'core_updater' ); 147 return $download; 148 } 149 150 $working_dir = $this->unpack_package( $download ); 151 if ( is_wp_error( $working_dir ) ) { 152 WP_Upgrader::release_lock( 'core_updater' ); 153 return $working_dir; 154 } 155 156 // Copy update-core.php from the new version into place. 157 if ( ! $wp_filesystem->copy( $working_dir . '/wordpress/wp-admin/includes/update-core.php', $wp_dir . 'wp-admin/includes/update-core.php', true ) ) { 158 $wp_filesystem->delete( $working_dir, true ); 159 WP_Upgrader::release_lock( 'core_updater' ); 160 return new WP_Error( 'copy_failed_for_update_core_file', __( 'The update cannot be installed because some files could not be copied. This is usually due to inconsistent file permissions.' ), 'wp-admin/includes/update-core.php' ); 161 } 162 $wp_filesystem->chmod( $wp_dir . 'wp-admin/includes/update-core.php', FS_CHMOD_FILE ); 163 164 wp_opcache_invalidate( ABSPATH . 'wp-admin/includes/update-core.php' ); 165 require_once ABSPATH . 'wp-admin/includes/update-core.php'; 166 167 if ( ! function_exists( 'update_core' ) ) { 168 WP_Upgrader::release_lock( 'core_updater' ); 169 return new WP_Error( 'copy_failed_space', $this->strings['copy_failed_space'] ); 170 } 171 172 $result = update_core( $working_dir, $wp_dir ); 173 174 // In the event of an issue, we may be able to roll back. 175 if ( $parsed_args['attempt_rollback'] && $current->packages->rollback && ! $parsed_args['do_rollback'] ) { 176 $try_rollback = false; 177 if ( is_wp_error( $result ) ) { 178 $error_code = $result->get_error_code(); 179 /* 180 * Not all errors are equal. These codes are critical: copy_failed__copy_dir, 181 * mkdir_failed__copy_dir, copy_failed__copy_dir_retry, and disk_full. 182 * do_rollback allows for update_core() to trigger a rollback if needed. 183 */ 184 if ( false !== strpos( $error_code, 'do_rollback' ) ) { 185 $try_rollback = true; 186 } elseif ( false !== strpos( $error_code, '__copy_dir' ) ) { 187 $try_rollback = true; 188 } elseif ( 'disk_full' === $error_code ) { 189 $try_rollback = true; 190 } 191 } 192 193 if ( $try_rollback ) { 194 /** This filter is documented in wp-admin/includes/update-core.php */ 195 apply_filters( 'update_feedback', $result ); 196 197 /** This filter is documented in wp-admin/includes/update-core.php */ 198 apply_filters( 'update_feedback', $this->strings['start_rollback'] ); 199 200 $rollback_result = $this->upgrade( $current, array_merge( $parsed_args, array( 'do_rollback' => true ) ) ); 201 202 $original_result = $result; 203 $result = new WP_Error( 204 'rollback_was_required', 205 $this->strings['rollback_was_required'], 206 (object) array( 207 'update' => $original_result, 208 'rollback' => $rollback_result, 209 ) 210 ); 211 } 212 } 213 214 /** This action is documented in wp-admin/includes/class-wp-upgrader.php */ 215 do_action( 216 'upgrader_process_complete', 217 $this, 218 array( 219 'action' => 'update', 220 'type' => 'core', 221 ) 222 ); 223 224 // Clear the current updates. 225 delete_site_transient( 'update_core' ); 226 227 if ( ! $parsed_args['do_rollback'] ) { 228 $stats = array( 229 'update_type' => $current->response, 230 'success' => true, 231 'fs_method' => $wp_filesystem->method, 232 'fs_method_forced' => defined( 'FS_METHOD' ) || has_filter( 'filesystem_method' ), 233 'fs_method_direct' => ! empty( $GLOBALS['_wp_filesystem_direct_method'] ) ? $GLOBALS['_wp_filesystem_direct_method'] : '', 234 'time_taken' => time() - $start_time, 235 'reported' => $wp_version, 236 'attempted' => $current->version, 237 ); 238 239 if ( is_wp_error( $result ) ) { 240 $stats['success'] = false; 241 // Did a rollback occur? 242 if ( ! empty( $try_rollback ) ) { 243 $stats['error_code'] = $original_result->get_error_code(); 244 $stats['error_data'] = $original_result->get_error_data(); 245 // Was the rollback successful? If not, collect its error too. 246 $stats['rollback'] = ! is_wp_error( $rollback_result ); 247 if ( is_wp_error( $rollback_result ) ) { 248 $stats['rollback_code'] = $rollback_result->get_error_code(); 249 $stats['rollback_data'] = $rollback_result->get_error_data(); 250 } 251 } else { 252 $stats['error_code'] = $result->get_error_code(); 253 $stats['error_data'] = $result->get_error_data(); 254 } 255 } 256 257 wp_version_check( $stats ); 258 } 259 260 WP_Upgrader::release_lock( 'core_updater' ); 261 262 return $result; 263 } 264 265 /** 266 * Determines if this WordPress Core version should update to an offered version or not. 267 * 268 * @since 3.7.0 269 * 270 * @param string $offered_ver The offered version, of the format x.y.z. 271 * @return bool True if we should update to the offered version, otherwise false. 272 */ 273 public static function should_update_to_version( $offered_ver ) { 274 require ABSPATH . WPINC . '/version.php'; // $wp_version; // x.y.z 275 276 $current_branch = implode( '.', array_slice( preg_split( '/[.-]/', $wp_version ), 0, 2 ) ); // x.y 277 $new_branch = implode( '.', array_slice( preg_split( '/[.-]/', $offered_ver ), 0, 2 ) ); // x.y 278 279 $current_is_development_version = (bool) strpos( $wp_version, '-' ); 280 281 // Defaults: 282 $upgrade_dev = get_site_option( 'auto_update_core_dev', 'enabled' ) === 'enabled'; 283 $upgrade_minor = get_site_option( 'auto_update_core_minor', 'enabled' ) === 'enabled'; 284 $upgrade_major = get_site_option( 'auto_update_core_major', 'unset' ) === 'enabled'; 285 286 // WP_AUTO_UPDATE_CORE = true (all), 'beta', 'rc', 'development', 'branch-development', 'minor', false. 287 if ( defined( 'WP_AUTO_UPDATE_CORE' ) ) { 288 if ( false === WP_AUTO_UPDATE_CORE ) { 289 // Defaults to turned off, unless a filter allows it. 290 $upgrade_dev = false; 291 $upgrade_minor = false; 292 $upgrade_major = false; 293 } elseif ( true === WP_AUTO_UPDATE_CORE 294 || in_array( WP_AUTO_UPDATE_CORE, array( 'beta', 'rc', 'development', 'branch-development' ), true ) 295 ) { 296 // ALL updates for core. 297 $upgrade_dev = true; 298 $upgrade_minor = true; 299 $upgrade_major = true; 300 } elseif ( 'minor' === WP_AUTO_UPDATE_CORE ) { 301 // Only minor updates for core. 302 $upgrade_dev = false; 303 $upgrade_minor = true; 304 $upgrade_major = false; 305 } 306 } 307 308 // 1: If we're already on that version, not much point in updating? 309 if ( $offered_ver === $wp_version ) { 310 return false; 311 } 312 313 // 2: If we're running a newer version, that's a nope. 314 if ( version_compare( $wp_version, $offered_ver, '>' ) ) { 315 return false; 316 } 317 318 $failure_data = get_site_option( 'auto_core_update_failed' ); 319 if ( $failure_data ) { 320 // If this was a critical update failure, cannot update. 321 if ( ! empty( $failure_data['critical'] ) ) { 322 return false; 323 } 324 325 // Don't claim we can update on update-core.php if we have a non-critical failure logged. 326 if ( $wp_version === $failure_data['current'] && false !== strpos( $offered_ver, '.1.next.minor' ) ) { 327 return false; 328 } 329 330 /* 331 * Cannot update if we're retrying the same A to B update that caused a non-critical failure. 332 * Some non-critical failures do allow retries, like download_failed. 333 * 3.7.1 => 3.7.2 resulted in files_not_writable, if we are still on 3.7.1 and still trying to update to 3.7.2. 334 */ 335 if ( empty( $failure_data['retry'] ) && $wp_version === $failure_data['current'] && $offered_ver === $failure_data['attempted'] ) { 336 return false; 337 } 338 } 339 340 // 3: 3.7-alpha-25000 -> 3.7-alpha-25678 -> 3.7-beta1 -> 3.7-beta2. 341 if ( $current_is_development_version ) { 342 343 /** 344 * Filters whether to enable automatic core updates for development versions. 345 * 346 * @since 3.7.0 347 * 348 * @param bool $upgrade_dev Whether to enable automatic updates for 349 * development versions. 350 */ 351 if ( ! apply_filters( 'allow_dev_auto_core_updates', $upgrade_dev ) ) { 352 return false; 353 } 354 // Else fall through to minor + major branches below. 355 } 356 357 // 4: Minor in-branch updates (3.7.0 -> 3.7.1 -> 3.7.2 -> 3.7.4). 358 if ( $current_branch === $new_branch ) { 359 360 /** 361 * Filters whether to enable minor automatic core updates. 362 * 363 * @since 3.7.0 364 * 365 * @param bool $upgrade_minor Whether to enable minor automatic core updates. 366 */ 367 return apply_filters( 'allow_minor_auto_core_updates', $upgrade_minor ); 368 } 369 370 // 5: Major version updates (3.7.0 -> 3.8.0 -> 3.9.1). 371 if ( version_compare( $new_branch, $current_branch, '>' ) ) { 372 373 /** 374 * Filters whether to enable major automatic core updates. 375 * 376 * @since 3.7.0 377 * 378 * @param bool $upgrade_major Whether to enable major automatic core updates. 379 */ 380 return apply_filters( 'allow_major_auto_core_updates', $upgrade_major ); 381 } 382 383 // If we're not sure, we don't want it. 384 return false; 385 } 386 387 /** 388 * Compare the disk file checksums against the expected checksums. 389 * 390 * @since 3.7.0 391 * 392 * @global string $wp_version The WordPress version string. 393 * @global string $wp_local_package Locale code of the package. 394 * 395 * @return bool True if the checksums match, otherwise false. 396 */ 397 public function check_files() { 398 global $wp_version, $wp_local_package; 399 400 $checksums = get_core_checksums( $wp_version, isset( $wp_local_package ) ? $wp_local_package : 'en_US' ); 401 402 if ( ! is_array( $checksums ) ) { 403 return false; 404 } 405 406 foreach ( $checksums as $file => $checksum ) { 407 // Skip files which get updated. 408 if ( 'wp-content' === substr( $file, 0, 10 ) ) { 409 continue; 410 } 411 if ( ! file_exists( ABSPATH . $file ) || md5_file( ABSPATH . $file ) !== $checksum ) { 412 return false; 413 } 414 } 415 416 return true; 417 } 418 }
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